May 5 (Eastern Orthodox liturgics)

• Virgin-martyr Sandukht [Sagdukht] (c. 50)[1]
• Great Virgin-martyr Irene of Thessaloniki (4th century)[2]
• Martyrs Irenaeus, Pellegrinus and Irene, at Thessaloniki (284–305)[3][4]
• Martyrs Neophytus, Gaius, and Gaianus[5]
• Saint Eulogius the Confessor, bishop of Edessa (c. 386)[4]
• Saints Martin and Heraclius, of Illyria (4th century)[6][7]
• Saint Hierax of Egypt (5th century)[8]
• Saint Euthymius the Wonderworker, bishop of Madytos on the Hellespont (c. 990)[9]
• Nun-martyr Martha, abbess of Monemvasia with three companions (990)[10]

• Martyr Jovinian, the lector of St. Peregrine of Auxerre (c. 304)[11]
• Saint Brito (Britonius) (386)[11]
• Saint Nectarius of Vienne, bishop of Vienne (c. 445)[11]
• Saint Nicetus of Vienne, fifteenth bishop of Vienne (c. 449)[11]
• Saint Hilary (Hilarion), Archbishop of Arles (449)[4][11][12]
• Saint Gerontius of Milan (470)[4][11][13]
• Martyr Crescentiana of Rome (5th century)[11][note 2]
• Saint Hydrock (Hydroc) of Cornwall (5th century)[11]
• Saint Gibrian, hermit in Ireland (509)[15]
• Saint Sacerdos of Saguntum (c. 560)[4][11]
• Saint Waldrada, first abbess of Saint-Pierre-aux-Nonnains in Metz in France (c. 620)[11]
• Saint Diuma, first Bishop of Mercia (c. 650)[16]
• Saint Maurontius of Douai (Maurontus, Mauront), founded monastery at Breuil-sur-lys near Douai, of which he is the patron-saint (701)[11]
• Saint Echa of Crayke, (Etha), Anglo-Saxon priest and monk-hermit at Crayke, near York, England (767)[11]

• Saints Barlaam of Serpukhov, and Gideon of Serpukhov (1377)[17][note 3]
• New Monk-martyr Ephraim of Nea Makri (1426)[19]
• New Hieromartyr Ephraim of Damascus, prophet (15th century)[20]
• Saint Adrian, abbot of Monza Monastery (1619)[21]

• Translation of the relics (980)[24] of Saint Aldhelm, Bishop of Sherborne (709)[22]
• Dedication of the Church of Mother of God of Kirou at Constantinople and commemoration of commemoration of the solar eclipse (1369)[25]
• Uncovering of the relics (1613) of Saint James of Zheleznoborov, Abbot of Zhelezny Bor (1442)[26]
• Uncovering of the relics (1675) of Saint Pachomius of Nerekhta, Abbot of Zhelezny Bor (1384)[27]
• Icon of the Most Holy Theotokos "Inexhaustible Cup" (1878)[26][28]

• 
  Great-martyr Irene of Thessaloniki.
• 
  St. Hydrock's Church, in Lanhydrock, Cornwall.
• 
  St. Platon of Banja Luka.
• 
  Icon of the Theotokos the Inexhaustible Chalice.

• May 5/18, Orthodox Calendar (PRAVOSLAVIE.RU)
• May 18, 2011 / May 5, HOLY TRINITY RUSSIAN ORTHODOX CHURCH (A parish of the Patriarchate of Moscow)
• May 5, OCA - The Lives of the Saints.
• May 5. Latin Saints of the Orthodox Patriarchate of Rome.
• May 5. The Roman Martyrology.

Greek Sources

• Great Synaxaristes: (in Greek) 5 ΜΑΪΟΥ, ΜΕΓΑΣ ΣΥΝΑΞΑΡΙΣΤΗΣ.
• (in Greek) Συναξαριστής. 5 Μαΐου. ECCLESIA.GR. (H ΕΚΚΛΗΣΙΑ ΤΗΣ ΕΛΛΑΔΟΣ).

Russian Sources

• (in Russian) 18 мая (5 мая). Православная Энциклопедия под редакцией Патриарха Московского и всея Руси Кирилла (электронная версия). (Orthodox Encyclopedia - Pravenc.ru).
• (in Russian) 5 мая (ст.ст.) 18 мая 2013 (нов. ст.). Русская Православная Церковь Отдел внешних церковных связей. (DECR).